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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418c7f7c86a003bb10ca14f6b3d5e7113ccd709e387e2c2c5c738b7103ca4b56' 
  AND token = 'lbY5ztV0zsEKX39aWuSFv1BG7W2z4iycol7q/+b57X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}